LTC2935_15 datasheet, PDF - EEWORLD Datasheet

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LTC2935_15: DescriptionUltra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds; File Size132KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC2935_15 Overview

Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds

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LTC2935

Ultra-Low Power Supervisor

with Power-Fail Output,

Selectable Thresholds

FEATURES

DESCRIPTION

The LTC

2935 ultra-low power voltage monitor provides

system initialization, power-fail warning and reset gen-

eration functions. Low quiescent current (500nA typical)

makes the LTC2935 an ideal choice for battery-operated

applications.

Three binary threshold-select inputs conﬁgure one of

eight integrated reset thresholds, ranging from 1.6V to

3.45V in pre-determined increments. Early warning of an

impending low voltage condition is provided at the power-

fail output (PFO), whose threshold is above the conﬁgured

reset threshold. Supervisory circuits monitor V

and

pull

RST

low when V

drops below the conﬁgured reset

threshold. When V

is rising from an under-threshold

condition, an internal reset timer is started after exceeding

the reset threshold by 5%. A 200ms reset timeout delays

the return of the

RST

output to a high state. A pushbut-

ton switch connected to the

input is typically used to

force a manual reset. Outputs

RST

and

PFO

are available

with open-drain (LTC2935-1/LTC2935-3) or active pull-up

(LTC2935-2/LTC2935-4) circuits. Operating temperature

range is from –40°C to 85°C.

500nA Quiescent Current

±1.5% (Max) Accuracy over Temperature

Integrated Precision Attenuators

Eight Pin-Selectable Reset Thresholds

Eight Pin-Selectable Power-Fail Thresholds

Early Warning Power-Fail Output

200ms Reset Timeout

Manual Reset Input

Compact 8-Lead, 2mm

2mm DFN and

TSOT-23 (ThinSOT™) Packages

APPLICATIONS

Portable Equipment

Battery-Powered Equipment

Security Systems

Point-of-Sale Devices

Wireless Systems

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

TYPICAL APPLICATION

Falling Threshold Selection Table

Conﬁgurable Low Power Voltage Monitor

0.1μF

GND

2935 TA01a

LTC2935-1/LTC2935-2

LTC2935-3/LTC2935-4

PFO

LTC2935-2

BATTERY

POWERED

SYSTEM

LOGIC

RST

RESET

POWER-FAIL

RESET

POWER-FAIL

THRESHOLD THRESHOLD THRESHOLD THRESHOLD

(V)

3.30

3.15

3.00

2.85

2.70

2.55

2.40

2.25

3.45

3.30

3.15

3.00

2.85

2.70

2.55

2.40

2.44

2.32

2.20

2.08

1.96

1.84

1.72

1.60

2.56

2.44

2.32

2.20

2.08

1.96

1.84

1.72

Low

High

Low

High

Low

High

Low

High

Low

High

2935fa

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